netcdf hope_lac_ceilo00_l2_zmlaa_1_7105148659103730096 {
dimensions:
time = 287 ;
nv = 2 ;
nlayer = 3 ;
variables:
float lat ;
lat:standard_name = "latitude" ;
lat:long_name = "latitude" ;
lat:comments = "Latitude of the measurement location in decimals." ;
lat:units = "degree_north" ;
float lon ;
lon:standard_name = "longitude" ;
lon:long_name = "longitude" ;
lon:comments = "Longitude of the measurement location in decimals." ;
lon:units = "degree_east" ;
short zsl ;
zsl:standard_name = "altitude" ;
zsl:long_name = "altitude above mean sea level" ;
zsl:units = "m" ;
double time(time) ;
time:standard_name = "time" ;
time:long_name = "time" ;
time:comments = "End of averaging period." ;
time:units = "seconds since 1970-01-01 00:00:00 UTC" ;
time:bounds = "time_bnds" ;
double time_bnds(time, nv) ;
float zmlaa(time) ;
zmlaa:long_name = "mixing layer height from aerosol" ;
zmlaa:ancillary_variables = "zmlaa_uncty zmlaa_bias" ;
zmlaa:comments = "Mixing layer height: the best estimate based on variable zal derived by the STRAT algorithm." ;
zmlaa:units = "m" ;
zmlaa:_FillValue = -999.f ;
short zmlaa_uncty ;
zmlaa_uncty:long_name = "uncertainty of mixing layer height retrieval from aerosol" ;
zmlaa_uncty:comments = "Uncertainty of variable was determined based on uncertainty that is caused by choice of sensor (Schween et al., 2014)." ;
zmlaa_uncty:units = "%" ;
float zmlaa_bias(time) ;
zmlaa_bias:long_name = "bias of mixing layer height from aerosol" ;
zmlaa_bias:comments = "Bias determined as a difference to reference Doppler lidar zmlaw retrieval (Schween et al., 2014)." ;
zmlaa_bias:units = "m" ;
zmlaa_bias:_FillValue = -999.f ;
float zal(time, nlayer) ;
zal:long_name = "height of aerosol layer" ;
zal:comments = "The 1st layer is the lowest detected layer.\n",
"The 2nd is the layer with the strongest gradient.\n",
"The 3rd is the layer with the second strongest gradient." ;
zal:units = "m" ;
zal:_FillValue = -999.f ;
float sunrise ;
sunrise:long_name = "time of sun rise" ;
sunrise:comments = "Retrieval of zmlaa is based on the best estimate between sunrise + 3 hours and sunset - 3 hours. Otherwise the lowest zal is chosen as zmlaa." ;
sunrise:units = "seconds since 1970-01-01 00:00:00 UTC" ;
float sunset ;
sunset:long_name = "time of sun set" ;
sunset:comments = "Retrieval of zmlaa is based on the best estimate between sunrise + 3 hours and sunset - 3 hours. Otherwise the lowest zal is chosen as zmlaa." ;
sunset:units = "seconds since 1970-01-01 00:00:00 UTC" ;
// global attributes:
:Title = "Jenoptik CHM15k ceilometer level-2 data: mixing layer height from aerosol backscatter" ;
:Institution = "Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany" ;
:Contact_person = "Patric Seifert ()" ;
:Source = "Jenoptik ceilometer: ID CHX090111, serlom TUB090013, software version 230s." ;
:History = "Data processing was done by University of Cologne. Zmlaa products were created with STRAT http://www.lmd.polytechnique.fr/~strat/downloadstrat.php (version 01.02) with configuration file STRAT_config_15min_jenopt_hdcp2_20141126.txt from level-1 attenuated backscatter data found in HD(CP)2 data base. Data in hope_lac_ceilo00_20130401_15min_jenopt_hdcp2_20141126.nc files were written into HD(CP)2 compliant format with jenoptik_zmlaa_hdcp2_0.1.1 and write_zmlaa_hdcp2_0.1.2." ;
:Conventions = "CF-1.6 where applicable" ;
:Processing_date = "2014-11-27 12:04:21 (CET)" ;
:Author = "Anne Hirsikko ()" ;
:Comments = "Mixing layer and aerosol layer heights from ceilometer aerosol backscatter profiles are based on STRAT-2D algorithm (Morille et al., BAMS, 2007). Uncertainty and bias estimations are based on analysis in Schween et al., AMT, 2014." ;
:License = "For non-commercial use only. This data is subject to the HD(CP)2 data policy to be found at hdcp2.zmaw.de and in the HD(CP)2 Observation Data Product Standard." ;
}